<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .main{
            margin: 0 auto;
            width: 1002px;
        }
        .add-l{
            position: fixed;
            left: 0;
            top: 100px;
        }
        .add-r{
            position: fixed;
            right: 0;
            top: 100px;
        }
    </style>
</head>
<body>
    <div class="main">
        <img src="images/box.png">
    </div>
    <div class="add-l">
        <img src="images/ad-l.png">
    </div>
    <div class="add-r">
        <img src="images/ad-r.png">
    </div>
</body>
</html>